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Optimum diesel fuel for clean diesel engines (CLEAN)


Objectives and problems to be solved: Fossil fuel powered IC engines will still constitutes the major land transport power trains at least over the next decades. Therefore, their impact on the global and local pollution and on the use of natural resources has to be minimized. The Diesel engine is the number one priority for its particularly low Well To Wheel (WTW) CO2 emissions. Nevertheless, it suffers from associated NOx and particulate emissions, which have to be significantly reduced in the near future. The objectives of the CLEAN project are therefore to develop solutions for new generations of co-optimised fuels and Diesel engines designed to reach lowest levels of pollutants in a system approach identifying new ways for clean future fuels where the impact of the use of these fuels will be studied in detail for assessing the still unexplored benefits of co-optimising fuels and engines as a single system. Description of the Work: Firstly, cost efficient clean fuel formulations will be addressed based on a comprehensive analysis of literature data on fuel engine interactions. These results will be compiled into a comprehensive document and a database. From this database promising fuel formulations - meeting future ecological and economical demands - will be derived for detailed investigations in advanced high-pressure direct injection Diesel engines. The engine design will be adapted to the specific properties of the fuels by optimising the injection system, the compression ratio and the swirl ratio for lowest possible emissions and best fuel efficiency. The main work will address the individual development and optimisation of the engine for each selected fuel. At first, optical diagnostics will be used to improve the insight into necessary engine modifications. Based on this detailed knowledge and on the corresponding data sets, the high-pressure injection single cylinder engine will be adapted by modifying accordingly the compression ratio, the bowl design, the EGR rate, the swirl ratio and the injection characteristics. This is of paramount importance to fully exploit the potential emission and efficiency benefits inherent in each future fuel. The results will be condensed into detailed recommendations and design criteria for co-optimising future clean fuels to advanced Diesel engines and their specific fuel needs. In the second phase of the project, five-car manufacturer will adapt their in-house advanced Diesel engine concepts to the optimisation criteria provided by phase 1 to achieve a co-optimised fuel-engine couple providing the practically lowest levels of pollutants and fuel consumption. The deliverables of the project will be detailed design criteria and consistent data for specifying innovative co-optimised fuel-engine-systems with an ultra low level of pollutant emissions, specially PM and NOx at reduced levels of CO2. Expected Results and Exploitation Plans: The anticipated advances in Diesel engine technology in this project are expected to exceed the progress achieved in the last decade by far, enabling major improvements in fuel efficiency, CO2 reduction and reduction of gaseous and particulate matter to very low values. Innovations are expected from the novel approach of treating the fuel as a design parameter which will have a significant effect on injector system design, combustion chamber design and on electronic control and management of the fuel/engine system on board a vehicle. The results should provide the framework for exploiting still unused potential innovations in European Diesel technology

Funding Scheme

CSC - Cost-sharing contracts


Mercedesstrasse 137, G-206
70567 Stuttgart

Participants (4)

25,Suesterfeldstrasse 200
52072 Aachen
Avenue De Bois Préau 1-4
92506 Rueil Malmaison
Berliner Ring 2
38436 Wolfsburg
Sven Hultins Gata 9A, Chalmers Teknikpark, Dept.
412 88 Goeteborg